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(No Model.) 2' Sheets-Sheet L F. TAGGART. APPARATUS FOR PULVERIZING GRAIN, ORBS, &c. I No. 256,071. Patented Apr. 4.1 882 K A? k l T il Zmmrm- N fizz/emf:

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F. TAGGART.

APPARATUS FOR PULVBRIZING GRAIN, 033%, Am. A No. 256,071. Patented Apr. 4,1882.

M I A %M WW u. PETERi mwumo n w. Walhiugion. u. c '1 UNITED STATES PATENT: VOFFICE.

FRANCIS TAGGART, OF BROOKLYN, NEW YORK.

APPARATUS FOR PULVERIZING GRAl N, ORES, 80C.

SPECIFICATION forming part of Letters Patent No. 256,071, dated April 4, 1882.

Application filed February 15, 1882. (No model.)

To all'whom tt may concern Be it known that 1, FRANCIS TAGGART, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Apparatus for Pulverizing Grain, Ores, 800., of which the following is a specification.

The improvement herein relates to an apparatus and process for reducing frangible substances to particles and collecting the products, for which a patent was granted to me October 18, 1881, No. 248,528.

The process embraced in said patent consists, in brief, in projecting the grains or granules with force against a hard abutment or obstacle by means of a continuous current of aeriform fluid under high pressure, into which the substance is introduced at a convenient point, whereby the latter is disintegrated, and then collecting the comminuted particles, while the aeriform fluid is allowed to escape, leaving behind the lighter products of the disintegration.

For carrying out said process I have described and shown in said patenttan ejector adapted to produce an annular jet of air drawing with it an interior volume of air, by which the grains or particles of the substance are brought into contact with the jet of air.

In an application for a patent filed by me November 25, 1881, No. 46,590, for improvement in apparatus for disintegrating and commiuuting grain and other frangible substances, Ihave described and shown,amon gother'thin gs, an ejector having a feeding and conducting tube or chute having at the end an orifice that is long and narrow, in combination with a chamber for containing air under high pressure, ajet-mout-h for the issuing current of air, adjacent to the end or orifice of the feeding and conducting tube or chute, and an abutment or surface of resistance; and the claim in such application specifically embraces such matter.

By'my present improvement the thin layer or stream of grain or substance is acted upon by separate air-jets and receives a uniform speed of movement, and at the same time prevents or avoids the accumulation of substance upon the surface of resistance and the formation of a cushion for the oncoming grains or fragments, and by such avoidance increases the economy and utility of the process by effecting the reduction of the projected grains or fragments in the least possibletime.

The drawings represent so much of the ap- Q paratus as illustrates the separate long and narrow issuing-orifices for the air-jet and for the substance to be reduced upon the surface of impact, in which- Figure 1 represents a vertical section; Fig. 2, a similar section taken at right angles to Fig. 1. Fig. 3 shows a cross-section at the line :0 00, Figs. 1 and 2, of the orifices or openings for the grain or substance and air, re-

spectively; and Fig. 4, the abutment, looking by the nozzle 6 of the feeding and conducting tube d for the substance to be reduced, and a directing and discharging chute or tube, 1),

communicating with the chamber a, containing atmospheric air or other aeriform fluid under suitable compression supplied by any suitable compressor.

The nozzle 0 is wider in one direction than in the other, and enters within and is surrounded by the air-jet-impelling tube or chute, of corresponding i'orm. The orifice b of the tube b is also wider in one direction than in the other, and enters the chamber wherein the disintegration of the substance is effected, and the abutment or surface of impact 0 is suitably supported within said chamber opposite to, in direct line with, and at a suitable distance from said jet-issuing orifice W, to receive the projected substance. v

The feeding and conducting tube d may pass into and through the compressed-air chamber, and it connects with and receives the substance to be treated from a hopper or suitable holder or supply-bin, (not shown,) and delivers it within the tube or chute I), back of the issu ing-orifice b preferably at a point near the communication of said tube 1) with the said compressed-air chamber.

The nozzle or orifice c is snffieiently long and narrow to cause the issuingjet of air under pressure from thejet-mouth s to act upon all the particles of matter issuing from said orifice 6, so that their impact upon the surface of resistance may be uniform, and hence each grain or particle of ore or other substance will receive the same shattering effect from the impact. V

The tube 1) of the air-chamber a is preferably in line with the substance-conducting tube (1, and the sides bl) d d,respectively, ofthese tubes are flat and form each a rectangular passage and orifice. As shown, the narrowest sides, I), of the feeding-tube b are joined with the corresponding sides of the dischargingtube at the nozzle end of the former, and this gives two separate and distinct air-issuingoriflees or jet-mouths, 8, Figs. 1 and 3, say, two: hundredthsof an inch wide by six inches long, while the nozzle 6 between the air-jets allows the substance to be projected in a thin sheet. Thejoining of the narrowest sides of the interior and of the exterior tubes at the ejectornozzle gives support to said nozzle and prevents the possible deflection at this point of the inner tube, and thereby maintain the fixed relation to each other of the independent jetmonths.

The chamber a is adapted to deliver air under pressure in a thin, wide sheet to the jetmouths, and the communication of the latter with said chamber is back of the nozzle of the inner tube. By this construction the capacity for work is increased by the application of the power of both the jets to draw air by their separate forces into the tube d along with the substance, and thus assist the power of the separate jets to impel the substance at a uniform velocity by reason of the air-jets operating with the forces of two separate and distinct ejectors upon one and the same column of the moving substance. The separate and distinct ejectors give a more efficient application of air-jet by the application of two jets of equal force on opposite sides only of the moving column of substance, and gives important ad vantages in lessening the frictional contact of the air, not only at the ejectororifices, but upon the interior walls of the dischargingtube.

The feeding and conducting tube (1 is preferably made flaring from its orifice, and the substance may be projected downwardly, as shown, or horizontally. The surface a of impact for the substance is preferably long and narrow to receive the projected sheet of the substance from the long and narrow issuingnozzle of the tube b.

The capacity for work may be increased by using any number of ejectors of the construction stated. It is obvious that the relation of the tubes composing the ejector device may be varied so long as the air and the substanceprojecting nozzles have the form and are employed in the combination shown and described.

I claim 1. The combination substantially hereinbefore set forth of the tube d, having at the end an orifice, e, that is long and narrow, a chamber for compressed air, and ajet-mouth adjacent to the end or orifice of said tube, with a tube, 1), having at the end an orifice, b that is long and narrow, and an abutment or surface of resistance, for the purpose specified.

2. The combination, in apparatus for disintegrating or comminuting frangible substances and collecting the product, of achamher for compressed air, with an ejector having separate and distinct long and narrow jet orifices or months 8 s, a tube, d, having an elongated orifice, e, a tube, 1), of corresponding form, and an abutment, 0, the nozzle end of said tube at being joined at its narrowest sides, I), with the corresponding sides of the tube 1), whereby to form the said separate and distinct ejector-orifices, for the purpose specified.

3. In an apparatus for disintegrating or comminuting grain and frangible substances and collecting the product, the combination substantially herein set forth of an ejector adapted to deliver air in separate and distinct thin wide sheets, a tube, d, adapted to deliver the substance or granules in a thin wide sheet, a chamber adapted to deliver air under pressure in thin wide sheets, and a tube, 12, adapted to deliver the separate air-jets in thin wide sheets, with an abutment, for the purpose specified.

4. In an apparatus for impelling substances through a tube by the action of air or other aerit'ortn fluid, the combination, with the tube d, having the flattened orifice e, of the tube I), forming with said orifice c the independent ejector-orifices s s on opposite sides of the said tube (1, substantially as described, for the purpose specified.

5. In an air-ejector, the combination of exterior and interior tubes, 1) and d, wider in one direction than in the other, joined together at the narrow sides I) b, substantially as herein described, for the purpose specified.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FRANCIS TAGGART.

\Vitncsses:

I SAAO S. SMITH, A. E. H. J ortNsoN. 

